Flow test device pressure and flow velocity double closed loop control system

Abstract

The invention discloses a flow test device pressure and flow velocity double closed loop control system. A pressure control closed-loop system is formed by a constant temperature water tank, a water supply unit, a constant pressure control acquisition sensor, a pressure automatic control regulator and an upper computer. When work voltage of the pressure control closed-loop system deviates from the set pressure, the constant pressure control acquisition sensor transmits a pressure signal to the pressure automatic control regulator and the upper computer respectively. A flow control closed-loop system is formed by a gauge inspection device, a flow velocity state acquisition sensor, a straight stroke flow regulating valve, a flow velocity control performer and an upper computer. When work flow velocity of the flow control closed-loop system deviates from the set flow velocity, the flow velocity state acquisition sensor transmits a flow velocity signal to the flow velocity control performer and the upper computer. Water supply pressure and work flow velocity are ensured to be simultaneously constant or mutually supplementary so that control of reduced device size and accurate energy saving can be realized, and degree of stability of flow velocity of work medium water of the device is lower than 0.5%.

Description

technical field [0001] The invention relates to the technical field of flow testing devices, in particular to a double closed-loop control system for pressure and flow rate of a flow testing device. Background technique [0002] At present, the reform of heat metering has been widely implemented in the northern regions of my country. There are more and more heat meter manufacturers and metering departments that implement the first compulsory verification of heat meters, and the demand for heat meter verification devices is also increasing. Due to the heat The meter device has only been used in my country for more than ten years, so most devices use a voltage regulator tank to control pressure changes, and most of the devices that use frequency conversion control are open-loop control, which is controlled by setting a fixed frequency. There are certain problems in both, resulting in unstable flow rate control, which affects the measurement accuracy, making it difficult to guara...

AI Technical Summary

Problems solved by technology

[0002] At present, the reform of heat metering has been widely implemented in the northern regions of my country. There are more and more heat meter manufacturers and metering departments that implement the first compulsory verification of heat meters, and the demand for heat meter verification devices is also increasing. Due to the heat The meter device has only been used in my country for more than ten years, so most devices use a voltage regulator tank to control pressure changes, and most of the devices that use frequency conversion control are open-loop control, which is controlled by setting a fixed frequency. There are certain problems in both of them, resulting in unstable flow rate control and affecting the measurement accuracy, making it difficult to guarantee product quality

[0003] In addition, according to EN1434-2015 (European heat meter standard) and the new national standard, the durability test is carried out on the heat meter, and the device also has the above defects; similar problems also exist in the water meter industry

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